During Apple's most recent financial earnings call in February, CEO Tim Cook said that the U.S. company had "an all-time record for revenue in mainland China" for its December quarter.

A key part of that revenue was, of course, the iPhone, but Apple also grew sales of its iPad, Mac, and smartwatch product lines during the same quarter.

Another interesting data point regarding iPhone sales in China that Cook highlighted during the call was that in the increasingly rich urban China, as well as in the US, the top five smartphones for the last quarter of the year were all iPhones.

Last year, Apple's revenue in Greater China (mainland China, Taiwan, Hong-Kong, and Macau) was $46 billion, roughly half of its U.S. business, representing 19% of its total sales for 2017.

According to Counterpoint, the iPhone grabbed 11% of the Chinese smartphone market, with roughly 51 million units sold, while Huawei leads with 19% market share with about 90 million units.


"And so, everywhere I look, I feel really good about how we're doing in China," added Cook.

China's Apple ban would trigger massive layoffs and a stock crash

However, if the Chinese government decides to ban the sale of Apple products for national security reasons, in retaliation for the implicit ban of Huawei and ZTE in the U.S., Apple could suddenly lose 19% of its revenue and access to the world's largest consumer market, which would have been a formidable growth-engine for its future.